Search for the decay $D_{s}^{+} \to p\bar{p}e^{+}\nu_{e}$

Abstract

Using a 3.19 fb$^{−1}$ data sample collected at the $\sqrt{s}$ = 4.178 GeV with the BESIII detector, we search for the rare decay $D_{s}^{+} \rightarrow p \bar{p} e^{+} \nu_{e}$. No significant signal is observed, and an upper limit of $\mathcal{B}(D_{s}^{+} \rightarrow p \bar{p} e^{+} \nu_{e}) < 2.0 \times 10^{-4}$ is set at the 90% confidence level. This measurement is useful input in understanding the baryonic transition of $D_{s}^{+}$ mesons.